SOLUTION: carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being

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Question 1060741: carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being tossed. when will the apple hit the ground? (hint height of the apple when it hits the ground will be 0)
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height,
h, of the apple in feet t seconds after being tossed. when will the apple hit the ground? (hint height of the apple when it hits the ground will be 0)
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t is the positive root of this equation 

-16t%5E2+%2B72t%2B40 = 0.


Solve by any way you know (use quadratic formula, for example) to get the answer: t = 1%2F2 = 0.5 second.


Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being tossed. when will the apple hit the ground?
----
h(t) = -16t^2 +72t+40
The 72t indicates she threw the apple upward at 72 ft/sec.
--> 5 seconds to impact.
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If you use
h(t) = -16t^2 -72t + 40 (throwing it downward)
Then it takes 1/2 second to impact, and hits her friend at 88 ft/sec (60 mi/hr)